Imagine you are building a house for your family. You've hired a builder and an architect. After months of work, you are about to move in when after a storm you discover your roof is leaking. Let's say the architect made a mistake and forgot to add an isolation layer in his plans for the roof. Should the builder have noticed it and warned you about it? Should he have warned the architect? Can you claim damages from the builder, the architect or both of them? If you want to know the answer to these and other questions, check out my PhD book - The service provider's duty to warn about defects caused by third parties - that has just been published.