In K.S. Manjunath & Ors. vs. Moorasavirappa, the Supreme Court held that an agreement to sell, being a non-determinable contract, cannot be unilaterally terminated unless the contract expressly permits it or termination is justified by the purchaser’s default. The Court ruled that where a vendor illegally terminates such an agreement, the purchaser need not seek a separate declaration challenging the termination and may directly sue for specific performance. The Court further held that subsequent purchasers cannot claim protection as bona fide purchasers under Section 19(b) of the Specific Relief Act if they had actual or constructive notice of the prior agreement and failed to make reasonable inquiries. Mere reliance on a termination notice does not establish good faith. Affirming the decree for specific performance, the Court emphasized that continuous readiness and willingness must be assessed from the purchaser’s overall conduct, both before and after the dispute.